ARID1A and neoplasm: Finally, ATrich interaction domain 1A (ARID1A) and BRCA1 associated protein 1 (BAP1) somatic single-nucleotide variants (SSNVs) were exclusive to sarcomatoid components and deficiency of ARID1A and BAP1 has been associated with worse prognosis, higher tumor grade, and a higher incidence of sarcomatoid histology [5].